Code P1721 on FX35 2009 model INFINITI

Question

Hello sir,i am getting error Code P1721 on my FX35 2009 model INFINITI. what will be exact problem of this??? is a big issue or just need to replace any part?

the issue hard shifting at low speed around 40-80kmh

Answer 1

P1721 Vehicle speed sensor MTR

This is simple , the vehicle sped sensor MTR, these tend to open after time of use and service